91808808 has 128 divisors (see below), whose sum is σ = 285573120. Its totient is φ = 23950080.

The previous prime is 91808807. The next prime is 91808819. The reversal of 91808808 is 80880819.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 91808808.

It is not an unprimeable number, because it can be changed into a prime (91808807) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 277203 + ... + 277533.

It is an arithmetic number, because the mean of its divisors is an integer number (2231040).

Almost surely, 2^91808808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91808808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142786560).

91808808 is an abundant number, since it is smaller than the sum of its proper divisors (193764312).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91808808 is a wasteful number, since it uses less digits than its factorization.

91808808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487 (or 483 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 42.

The square root of 91808808 is about 9581.6912912074. The cubic root of 91808808 is about 451.1228060058.

The spelling of 91808808 in words is "ninety-one million, eight hundred eight thousand, eight hundred eight".